Results / Research

Challenges of the infiltration method for halide-based solid‑state battery cathodes

DEM simulation of solid-electrolyte separator and cathode densification using a stress-based multi-contact elasto-plastic model

This publication presents a new DEM modelling framework to better predict the densification of solid-electrolyte separators and cathodes in all-solid-state batteries. By improving the simulation of particle interactions under high compaction pressures, the study supports the identification of suitable processing parameters to enhance component performance during cell assembly and cycling.

Project Management Handbook

The aim of this document is to specify the procedures for technical and financial reporting, the presentation standards for deliverables and reports to the EC, the measures to ensure timely reporting and the internal review procedure to guarantee the quality of the results. Therefore, this deliverable will provide a common HELENA project management guide to all members of the consortium. The procedures contained in this guide will ensure the efficiency and final quality of the deliverables and will reduce the risk of the project.

Recycling targets and safety requirements based on the chemistry of HELENA battery system

The HELENA project aims to design a solid-state battery that meets the requirements for use in electric vehicles and airplanes, while also being optimised for high currents and stable cycling. The project also aims to assess the environmental compatibility of the battery design and its potential for future recycling. The battery system contains various components, some of which are well-known for recycling, while others are experimental.

Multiscale/Multiphysics modelling framework definition and requirements

Within HELENA project WP7 aims at providing material and cell manufacturers model-based guidance at three main scales (atomistic, microstructural, full cell) and tools to optimize cell and electrode design and anticipate full cell behavior and lifetime. This will rely on a Multiscale Multiphysics modelling approach able to account for optimization from material to cell design and exhibit the consequences up until the final application system.

D9.2 Project website and social media presence

This compilation has been developed as an integral facet of Task 9, which centres on Sharing, Outreach, and Application. It encompasses a detailed representation of the website www.helenaproject.eu, conceived for the initiative´s purposes, along with the imminent initiatives within the project´s social media networks. Acting as the central instrument to execute the project´s strategy in terms of sharing and capitalizing on achievements (D9.1), the HELENA project´s website plays a pivotal role, while the primary avenues for disseminating these communications are the project´s social media channels.

HELENA Project´s Trifold

The HELENA project tri-fold brochure summarizes in two pages the most important aspects of the project, such as the objective, the applications and the technology to be developed.

Stable cycling of halide solid state electrolyte enabled by a dynamic layered solid electrolyte interphase between Li metal and Li3YCl4Br2

Halides are potential electrolytes for Li metal solid state batteries owing to their combination of high ionic conductivity, ductility and electrochemical stability against oxidation. However, their reactivity with the Li metal electrode may result in the formation of secondary compounds hindering their practical utility in terms of cycling performance as key indicator in battery operation. In this work, we investigate the high performance of symmetric cells with Li₃YCl₄Br₂ halide and bare Li-metal electrode, able to withstand 1000 h of Li electrodeposition-dissolution with an overpotential as low as 46 mV. 

Insights into the chemical and electrochemical behavior of halide and sulfide electrolytes in all-solid-state batteries

Solid-state lithium batteries (SSBs) offer improved safety and higher energy density compared to conventional lithium-ion batteries, but challenges remain with solid electrolytes, particularly at the lithium metal interface. This study investigates a composite electrolyte (Li₃YCl₄Br₂:Li₆PS₅Cl) combining halide and sulfide materials to enhance chemical and electrochemical stability. The results show that this approach prevents side reactions at the lithium interface, increases cycle life, and improves critical current density, providing a promising pathway for next-generation SSBs.